On 2/27/19, 2:20 PM, "Keller, Jacob E" <jacob.e.kel...@intel.com> wrote:
> -----Original Message-----
> From: Paul Thomas [mailto:pthomas8...@gmail.com]
> Sent: Wednesday, February 27, 2019 2:06 PM
> To: linuxptp-devel@lists.sourceforge.net
> Subject: [Linuxptp-devel] strangeness
> Using gdb I was able to narrow this down to the ioctl(fd,
> SIOCSHWTSTAMP, &ifreq); on line 88 of sk.c. When single stepping with
> gdb before this line ssh still works fine, after this it is broken
> until a reboot.
>
This sounds very suspicious of a driver bug in the driver's SIOCHWTSTAMP
handler.
> So tomorrow I was planning to try and create a standalone testcase
> with the ioctl() and then try to map that in the kernel driver some. I
> thought I would go ahead and post this in case anyone else had any
> thoughts.
>
> HW/SW setup:
> This is on an arm64 system (xilinx zynqmp) using the macb ethernet driver:
> https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18841740/Macb+Driver
>
I would think the best bet is to investigate the macb ethernet driver and
see what it does, and if anything looks like it would break SSH connections.
Also, in the "missing features" section of the above link, I see:
* No IEEE 1588 support for Zynq as the timestamp implementation in IP is not
accurate enough.
This makes me think that timestamping is not supported and the ioctl
corresponding to that is not handled properly in the driver.
Thanks,
Vedang
Thanks,
Jake
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